Ward Beullens found a practical key-recovery attack against Rainbow.
The level I parametersets are removed from liboqs starting from version 0.7.2.
Find the scientific details in Breaking Rainbow Takes a Weekend on a Laptop.

This means all the oqs::sig::Algorithm::RainbowI* variants are insecure.

References

• https://github.com/open-quantum-safe/liboqs-rust
• https://groups.google.com/a/list.nist.gov/g/pqc-forum/c/KFgw5_qCXiI?pli=1
• https://rustsec.org/advisories/RUSTSEC-2022-0047.html